94 Reports and Proceedings —Mineralogical Society. 
Lossiemouth. Two imperfect skeletons of the same species are also 
shown on a slab of the same sandstone in the British Museum 
(Natural History). The head and trunk measure only 4 inches in 
length, but there is a very long and slender tail. The head is 
relatively large, and resembles that of Ornithosuchus in many 
respects ; but the fossils do not exhibit any teeth. There are about 
twenty-one presacral vertebrae, of which nine are cervical. There 
are distinet traces of a plastron of delicate abdominal ribs. The 
limb-bones exhibit a large internal cavity. The fore-limbs are very 
-small, with a humerus as long as the radius and ulna. The hind- 
‘limbs are relatively large, and the ilium is extended antero- 
posteriorly for the length of four vertebre. The femur is almost as 
long as the tibia and fibula; while the metatarsus is especially 
remarkable, being half as long as the tibia, and consisting of four 
metatarsals of nearly equal length firmly fused together. The toes 
vare long and slender, with sharply pointed claws. The author 
concludes that this must have been a running or leaping reptile, and 
‘that it represents a new genus of Dinosauria related to the American 
‘Triassic Hallopus. 
MineratoeicaL Society. 
“November 13, 1906.—Prof. H. A. Miers, F.R.S., President, in the Chair, 
Growth of crystals of soluble salts on each other, by Mr. T. V. 
Barker. This paper is a continuation of the author’s previous work 
.on the growth of salts on isostructural minerals to those of soluble 
isomorphous salts on each other. The group now investigated is that 
.of the chlorides, bromides, iodides, and cyanides of Na, K, Rb, Cs, and 
Am, which crystallise in the cubic system. ‘The view previously 
-entertained that parallel growths are conditioned by a similarity of 
‘molecular volume is again found to hold good; some apparent ex- 
ceptions are explained ‘by the presence of isodimorphism. One pair 
of salts, however, NaCl-K Cl yield parallel growths, although the 
‘molecular volumes are greatly different; ‘this is perhaps to be 
accounted for by the fact that the molecular volumes are almost 
exactly in the ratio 1: 2.— Notes on some Bolivian minerals, by 
Mr. L. J. Spencer. Descriptions are given of crystallised Jamesonite, 
*Semseyite from Oruro, new crystal-forms on Andorite, Chalcostibite 
-from Oruro, Augelite from Oruro, Vivianite from Tatasi and Tasna, 
Tetrahedrite from Huanchaca, regular grouping of Stannite and 
‘Tetrahedrite, Valentinite, Cassiterite, Tourmaline, and ‘ourmaline- 
hornfels, Fluor, Apatite, cupriferous Miargyrite from Tatasi, crys- 
tallised Miargyrite from Aullagas, Jarosite from Chocaya, Chalybite 
‘from Chorolque and Tatasi, Enargite from Chorolque.— Note on 
Ilmenite from Brazil, by Mr. G. F. Herbert Smith. The crystals 
have three habits, cam, camrX, cnXrs, differing slightly from those 
described from the same locality by Hussak. The hemihedrism is 
-shown by striations on the prism faces; some magnesium is present.— 
Description of the Lengenbach Quarry and of the minerals found there 
‘in 1906, by Mr. R. H. Solly. The now well-known quarry was 
opened about the year 1850, and various new minerals were descrihed 
~by Des Cloizeaux and others. From 1860-70 a level was driven in 
